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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7085f2ffbc177e3dbfcee8c99ee7ea4b67fdb8e012588b8568cff9ba6b7b28e3' 
  AND token = 'OU8xXr8tt+6OTp4mA4IH36tsJuG2cJHbHtfRHXa+76g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}